Free Online Tools
A growing collection of free calculators, generators, converters, and decision makers — every one runs entirely in your browser. Nothing to install, no sign-up, and your data never leaves your device.
JSON Validator & Formatter
Validate JSON for errors and format it with custom indentation — all in one tool.
Random Password Generator
Generate strong, secure random passwords with custom length and character options.
UUID Generator
Generate version 4 UUIDs (Universally Unique Identifiers) instantly. Generate up to 20 at once and copy with one click.
API Key Generator
Generate secure, random API keys with an optional prefix and configurable length.
QR Code Generator
Create a QR code from any text or URL and download it as a PNG image.
Barcode Generator
Generate Code 128, Code 39, EAN-13, and UPC barcodes and download them as PNG or SVG.
Word Counter
Count words, characters, sentences, and paragraphs in your text instantly.
Text Compare
Compare two blocks of text and highlight exactly what was added, removed, or changed between them.
Discount Calculator
Enter an original price and discount percentage to instantly see the final price and how much you save.
Random Number Generator
Generate random numbers within any range instantly.
Percentage Calculator
Calculate percentages instantly — find what percent X is of Y, or calculate X% of Y.
Tip Calculator
Calculate the tip on any bill by percentage and split the total among multiple people.
Unit Converter
Convert between common units — centimetres & inches, kilograms & pounds, metres & feet, kilometres & miles.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin instantly — enter one value and see the other two scales at once.
BMI Calculator
Calculate your Body Mass Index (BMI) and find out your weight category.
Age Calculator
Calculate your exact age in years, months, and days from your date of birth.
Random Name Generator
Generate random first names, last names, or full names for any purpose.
Spin the Wheel
Add your choices to the wheel and spin for a random result.
Yes/No Generator
Get an instant random Yes or No answer to any question.
Random Decision Maker
Can't decide? Enter your options and let the random picker choose for you.
Loan & EMI Calculator
Calculate your monthly loan instalment, total interest, and total repayment amount.
Calorie Calculator
Calculate your daily calorie needs based on age, weight, height, and activity level.
Compound Interest Calculator
Calculate how your investment grows over time with compound interest.
GPA Calculator
Calculate your weighted GPA from course grades and credit hours.
Which World Cup 2026 Team Are You?
Answer 8 fun questions and discover which 2026 FIFA World Cup nation matches your personality.
World Cup 2026 Bracket Predictor
Build your own 2026 FIFA World Cup knockout bracket and predict the champion in a few taps.
Countdown Timer
A free online countdown timer with Pomodoro presets, start/pause/reset, and an alarm when time is up.
Coin Flip
Flip a virtual coin online for an instant, fair heads-or-tails result with a running tally.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more instantly.
Color Converter
Convert colors between HEX, RGB, and HSL with a live picker and one-click copy.
Sales Tax Calculator
Enter an amount and tax rate to instantly see the tax added and the total price you pay.
Days Between Dates Calculator
Pick two dates to instantly see the number of days, weeks, and months between them.
Hourly to Salary Calculator
Convert an hourly wage into annual, monthly, weekly, and daily pay in seconds.
Free Calculators, Generators & Converters — All in One Place
QTNest brings together the everyday tools people search for most, without the clutter, pop-ups, or accounts that bog down so many utility sites. Whether you need to crunch a quick number, generate something random, or settle a decision, the right tool is a couple of clicks away — and it works the same on your phone as on your desktop.
The calculators cover the numbers that come up in real life: work out repayments with the Loan Calculator, add tax to a price with the Sales Tax Calculator, convert an hourly wage into a yearly figure with the Hourly to Salary Calculator, count the gap between two dates with the Days Between Dates Calculator, or check your BMI and percentages.
The generators create things on demand — a secure password, a scannable QR code, a unique UUID, or a random name. And when you just need to decide, the Yes/No Generator, Spin the Wheel, and Random Picker take the pressure off.
Every tool is genuinely free and runs client-side, which means whatever you type — a price, a password, a block of JSON — stays in your browser and is never uploaded or stored. Prefer a guided tour? Our blog post on the best free online tools walks through the most popular ones and when to reach for each.